It happened in the eastbound lanes of Ridge Road, near Leo Kidd, in Port Richey, Florida. Police Chief Gerard DeCanio said this was the "craziest thing [he's] ever seen."

DeCanio said the side wheelchair liftgate of a mobile PET scan vehicle somehow became dislodged. As the vehicle passed a line of bicyclists headed east on Ridge Road, the liftgate hit them, one-by-one.

DeCanio said four bicyclists were hit. Two of them had serious injuries and were in surgery at a nearby hospital.

Port Richey police officers said they were speaking to the driver. It was unclear whether the driver knew he hit the bicyclists.

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Two eastbound lanes of Ridge Road at Leo Kidd were closed. Port Richey police are investigating the crash.